Guard for grinding-machines.



E. 0. PARTRIDGE.

GUARD FOR GRINDING MACHINES.

v APPLICATION FILED JULY 21, 1915. 4 1,21 7,996. Patented Mar.6,1917.

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E. 0. PARTRIDGE. GUARD FOR GRINDING MACHINES.

APPLICATION FILED JULY ZI 19'5- 1,217,996. Patented Mar. 6, 1917.

2 SHEETSSHEET 2- EDWARD o. PABTRIDGE, or emailed ILLINOIS.

GUARD FOR GRINDING-MACHINES.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed July 21, 1915. Serial No. 41,031.

To all whom it may concern:

Be it known that I, EDWARD O. PARTRIDGE, citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Guards for Grinding-Machines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains tomake and use the same.

My invention relates to guards for grinding machines, its generalobjects being to provide a simple and which will effectively house allexcept a front peripheral portion of the abrasive wheel, and which willentirely house the end of the wheel arbor and any. nut on this end ofthe arbor: to provide simple and effective means for adjusting portionsof the guard to follow the changing contour of the wheel as the latterwears, and for permitting a ready replacing of the wheel: to providesuction means for drawing off the detached particles of both the wheeland the articles that are being ground upon the latter, and to sodispose the suction that fragments of the wheel will not be likely toenter and damage this pipe in case the wheel bursts. More detailedobjects are to provide a guard having relatively movable side pieceslaterally housing the wheel and effectivelyconnected by a backperipherally housing the greater part of the wheel: to provide movableflaps or followers substantially forming continuations of said back, andhaving wings overlapping the side pieces and preventing the exit ofdetached particles between these flaps and the side pieces: to-

utilize the side wings for maintaining the movable side piece in itsnormal or operative position: to provide positive means for locking eachflap in a plurality of positions corresponding to various diameters ofthe wheel: and to provide speedy access to the interior of the guard forremoving any particles which may accumulate in the same.

In the drawings, Figure 1 is a fragmentary side elevation of a grinderequipped with the guard of my invention.

Fig. 2 is a fragmentary front elevation of the same.

Fig. 3 is a fragmentary elevation similar to Fig. 1 but with the guardopened to permit a removal or replacing of the abrasive wheel.

relatively cheap guard Fig. 4 is a fragmentary horizontal section alongthe line 4-4 of Fig. 2.

In the embodiment of the drawings, the grinder includes an abrasivewheel 1 mounted on a shaft or arbor 2 journaled in a bearing 3 anddriven by a pulley 1, the wheelbeing clamped between washers 5 by nuts 6threaded on the arbor 2. Secured to the base '7 of the grinding machineby a bracket 8 is the inner side piece 9 of the guard, which side piecehas a notch 10 spanning the washer 5 on the side of the wheel facing thebearing 3. Pivoted to the side piece 9, as by pins 11 extending throughsuitable lugs, is the outer side piece 12, which latter has no notch buthas a laterally extending double dome formation 13 normally housing theouter end of the arbor 2 and the nut 5 adjacent to this end of thearbor. Operatively connecting the two side pieces and preferablyintegral with the stationary side piece 9 is a back 14 whichperipherally incloses the entire rear half of the wheel 1 and extendsforwardly both at the top and bottom of the wheel, being enlarged ateach end into a lug 15. Pivoted to each lug is a curved flap or follower16 having wings 17 overlapping the outer edges of the two side pieces,this flap being preferably pivoted intermediate its ends and terminatingat its rear end in a lug 18. The lugs and 18 are provided withhorizontal bores 20 adapted to be brought successively into alinementwhen the flap is moved about its pivot, thereby permitting a bolt 21 tobe inserted in the alined bores .of the two lugs so as to anchor theflap against movement about its pivot. r

The two side pieces also preferably have alined apertures 22 forreceiving bolts'23, thereby enabling the movable side piece to beclamped in its closed or "operative position. The inner side piece 9 ispreferably enlarged at its lower rear end and equipped with an aperture24 leading to a suction pipe 25 through which any detached particles ofeitherthe abrasive wheel or the ground materials may be drawn off. Whenthe guard is in operative position (as in Fig. 1) the side pieces, backand flaps combine to form a housing which front of the latter. The upperflap may be adjusted quite close to the wheel: while the lower flap ispreferably adjusted so as to catch the downwardly directed particlesonly exposes a relatively "small peripheral portion of the wheel at thewhich are detached during the grinding, thus causing the latter to enterthe guard and to be drawn off through the suction pipe 25. lVhen thewheel wears, each flap or follower may be quickly adjusted by moving thebolt 21 from one to another of the alined holes in the. said lugs, thuspermitting the flaps to be effective as continuations of the back orperipheral portion of the guard.

'Moreover, the Wings 17 will prevent any Fig. 3), the wings "an readilybe swung clear of the movable side piece, thereby permitting the latterto be swung open as in Fig. \Vhen this is done, access is readily had tothe wheel, so that this can be removed or replaced in a very fewminutes, Moreover, this opening of the guard also affords access to theentire interior, thereby permitting this to be brushed out in case thesuction has not been ample.

It will be evident from the drawings that the guard of my invention hasbut few parts and these of such design as to be read ily made of steelor malleable iron: that all parts are positively locked, so that abursting wheel will not shift them in position: that the neededadjusting is easily and quickly accomplished, and that a downwardlyflying fragment will impact against the lower corner of the back insteadof flying directly into the suction pipe. To improve the appearance, Ipreferably make the laterally recessed portion of the movable side piecein the shape of a double dome. However, I do not wish to be limited tothis or other details of the construction herein disclosed, since thesedetails might be varied in many ways without departing fro-m the spiritof my invention.

I claim as my invention:

1. A guard for a grinding wheel and the shaft thereof, including a pairof side pieces disposed on opposite sides of the wheel and pivotallyjoined back of the wheel, one of said side pieces having a recessedportion housing an end of the shaft, the said pivotal joining beingsodisposed. as to permit the last named side piece to be swung around toafford access to the said end of the shaft and'to permit removal of thewheel.

2. A guard for a grinding wheel and the shaft thereof, including a pairof side pieces disposed on opposite sides of the wheel. and pivotallyjoined back of the wheel, the said side pieces-exposing a frontalportion of the wheel: and a pair of followers adjustahly mounted on oneof the side piecesat the front thereof and presenting tips dir i'tedtoward each other and partially covering the said exposed frontal.portion of the wheel, each of said followers having wings overlappingportions of the said side pieces.

3. A guard for a. grinding wheel and the shaft thereof, including a pairof side pieces disposed on. opposite sides of the wheel, one thereofrigidly mounted and the other mov able laterally with respect to thewheel, the mo "able side piece having a recessed portion housing an endof said shaft.

4. A guard for a grinding wheel, including a pair ofrelatively movableside plates exposing a frontal portion of the wheel but otherwiseextending radially beyond the periphery of the wheel, a back integralwith oneof the side plates and normally joining the edges ofthe saidradially extending portions, :1 pair of followers pivoted upon the lastnamed side plate and extending to ward each other, and interlockingmeans associated respectively with the opposite ends of the followersand the last named side plate for latching the said followers in theiroperative positions.

EDlVARD O. PARTRIDG-E.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

